$\left(12a+7b\right)\left(a-2b\right)$
$\frac{d}{dy}\sqrt{x^2+y^2}$
$\frac{4x}{1+2x-3x^2}$
$156m+\left(-636m\right)$
$-5t+20\ge15$
$\sec^2\left(x\right)+3\tan\left(x\right)-5$
$\int\frac{\pi}{\frac{\pi}{3}}\left(1+\cos\left(x\right)\right)dx$
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